Hi,
I'd also suggest what Christophe said. Do the projection of some tiles
manually before VPB is run. I normally use something like:
gdalwarp -t_srs "+proj=latlong +datum=WGS84" -r bilinear $name
../reprojected/$newname
Then load the tiles into something like QGIS (http://www.qgis.org/) to
see if they line up.
jp
christophe loustaunau wrote:
Hi Shayne,
Maybe you could reproject your imagery to a geographic projection with
gdal (gdal_translate) and see if you have the same artifact.
You will know if it's a VPB or a gdal reprojection problem.
On Wed, Dec 10, 2008 at 6:14 PM, Tueller, Shayne R Civ USAF AFMC 519
SMXS/MXDEC <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
I've built a geocentric database using VBP 0.9.7. <http://0.9.7.>
The imagery is GeoTiff tiles that are NAIP 1 meter UTM and the
elevation is DTED level 1. The GeoTiffs appear to be reprojected by
VPB (I assume using GDAL internally) for the geocentric database
setting. Things appear to build just fine without error but when I
view the database in OSG, I see a nasty discontinuity across texture
tile boundaries. You can clearly see this in the airfield picture
that is attached. The landing strip does not line up across the tile
boundary. I've verified that the tiles themselves are correct across
boundaries before I fed them into VPB. The discontinuity appears
regardless of the LOD that is being paged in.
My question is, is this an artifact that I must live with since the
original imagery is based in UTM and the reprojection that VPB does
(or GDAL) introduces inaccuracies when going to a geocentric
database? Is there something else I can do to eliminate these
discontinuities?
Any input or ideas anyone can suggest to eliminate these
discontinuities in the database would be welcome.
Thanks,
-Shayne
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